A gas water heater has many cost saving benefits. Gas contains higher heating energy and saves more power by 95% compared to electric, provides unparalleled water flow rate, and never runs out of hot water as compared to an Electric water heater. Unlike the Electric storage water heater (Concealed type) which requires a certain preheat time, Rinnai Gas water heater uses Rapidstart technology to speed up the ignition process of the water heater, ultimately delivering hot water faster.